Glass-scoring and breaking apparatus



Oct. 6, 1964 J. J. BRAND 3,151,794

GLASS-SCORING AND BREAKING APPARATUS Filed Feb. 26, 1960 1O Sheets-Sheet1 FIG. \5

I4TTOZIVE'Y Oct. 6, 1964 J. J. BRAND GLASS-SCORING AND BREAKINGAPPARATUS 1o Sheets-Sheet 2 Filed Feb. 26, 1960 INVENTOR. J47 J EMA D J.J. BRAND GLASS-SCORING AND BREAKING APPARATUS Oct. 6, 1964 Filed Feb.26, 1960 l I l :r" TOR.

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Armmr Oct. 6, 1964 J. .1. BRAND GLASS-SCORING AND BREAKING APPARATUS 10Sheets-Sheet 10 Filed Feb. 26, 1960 SEWJ , INVENTOR. JAY J. .BPA/VD'llllllll-lllllll Ill-IL United States Patent 3,151,794 GLASS-SCORE GAND BREAKING APPARATUS Slay J. Brand, Whitehall Borough, Pa., assignorto Pittsburgh Plate Glass Company, Allegheny ounty, Pa., a. corporationof Pennsylvania Filed Feb. 26, 196i), Ser. No. 11,261 18 Claims. (Cl.225-965) This invention relates to a glass cutting apparatus and morespecifically relates to an apparatus for cutting or merely scoring aglass sheet along a set of parallel lines and along another set ofparallel lines which are normal to the first set of paralle lines.

In the apparatus of the present invention a glass sheet is moved by aconveyor to a cutting station where the glass sheet is first preferablymoved laterally, with respect to its original path of movement providedby the conveyor, by a pair of pusher members to insure that the abuttededge of the glass sheet is properly indexed in alignment with theoriginal path of travel aiforded by the conveyor means. The apparatusfurther includes at the cutting station a pair of movable bridges thatmove in horizontal directions normal to each other and which supportcutter assemblies having cutter wheels so that the glass sheet isprovided with at least two sets of score lines. In each set score linesare parallel and one set is normal to the other set.

it is an object of the present invention to provide an apparatus formaking two sets of parallel score lines on a glass sheet at a cuttingstation in which the sets of score lines are normal to each other.

It is a further object of this invention to provide an apparatus formaking on a glass sheet two sets of parallel score lines in which theentire scoring or cutting operation is carried out completelyautomatically in a programmed sequence of operation.

it is still a further object of this invention to provide an apparatusoccupying a relatively small amount of floor and having a pair ofmovable bridges supporting cutter assemblies for making two sets ofparallel score lines on a stationary glass sheet in which the sets arenormal to each other. I

These and other objects of this invention will be apparent to oneskilled in the art from the description which follows of a preferredembodiment of the apparatus taken along with the drawings in whichsimilar parts are generally designated by the same numeral and in which:

FIG. 1 is a plan showing the general arrangement of the apparatus of thepresent invention in its relationship with conveyors for feeding glasssheets to the apparatus, and conveyors and apparatus for receiving andsnapping the scored glass sheet to run the cuts along the score lineswhich are normal to the direction of travel of the sheet through thecutting apparatus;

FIG. 2 is a plan of the cutting apparatus with parts removed;

FIG. 3 is a front elevation of the cutting apparatus;

FIG. 4 is a side elevation of the cutting apparatus;

FIG. 5 is a fragmentary cross section of the apparatus taken along line55 of FIG. 2;

FIG. 6 is a fragmentary side elevation of the apparatus taken from aside opposite that of 3 18. 4 andshowing one of the movable'bridges ofthe invention partly away from its home position; 1

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FIG. 7 is a cross section taken along the line 7-'7 of FIG. 6;

FIG. 8 is a fragmentary plan showing the portion of the appaartus shownin elevation in FIG. 6;

FIG. '9 is a cross section taken along the line 99 of FIG. 8;

FIG. 10 is a fragmentary front elevation of one of the positioningmechanisms for indexing one of the sets of cutter assemblies atdistances from one another that are multiples of a unit of length;

FIG. 11 is a plan of the positioning mechanism shown in FIG. 10;

FIG. 12 is a fragmentary cross section of one of the movable bridges ofthe invention showing in elevation one of the cutter assemblies;

FIG. 13 is a cross section taken along line 1313 of FIG. 12;

FIG. 14 is a plan of the cutter assembly shown in FIG. 12;

FIG. 15 is a fragmentary side elevation of one of the movable bridges ofthe apparatus showing one of the two cut-running devices which aremounted near opposite ends of the movable bridge;

FIG. 16 is a front elevation of the upper portion of one of the cutterassemblies;

FIG. 17 is a front elevation of a lower portion of one of the cutterassemblies;

FIG. 18 is a vertical section taken along the line 18-18 of FIG. 16;

FIG. 19 is a vertical cross section taken along the line l919 of FIG.17;

FIG. 20 is a front elevation of a part of the apparatus showing an upperportion of the squaring device of the apparatus;

HS. 21 is a side elevation showing the upper portion of the squaringdevice seen in FIG. 20;

FlG. 22 is a schematic drawing of electrical circuitry used in theapparatus; and

FIG. 23 is a schematic drawing of part of the electrical circuitry tooperate the drive motors for the moving bridges at slow and fast speedsin forward and reverse directions.

The glass cutting apparatus of the present invention is generallyindicated at 25 in FIG. 1 in which it is shown in an illustrativeembodiment wherekit is associated with other apparatus from which glasssheets are received and other apparatus to which the glass cuttingapparatus of this invention feeds the scored glass sheets to be snappedalong one of the sets of score lines; if such snapping is required. Theassociated apparatus with the glass cutting apparatus in FIG. 1 includesa glass sheet drawing apparatus generally indicated at 26 which producesan upwardly moving vertical ribbon ofgl'ass which is cut trans verselyto proper lengths to produce sheets known as capped sheets. Each cappedsheet is laid down onto a horizontal belt conveyor means generallyindicated at 27 by a laydown conveyor arm (not shown). The conveyor 27transfers the glass sheets to atake-away conveyor generally indicated at28 which transfers each capped glass sheet to a corner transfer tableconveyor generally indicated at 29 to transfer it laterally of itsoriginal horizontal travel onto a conveyor 30 which feeds the glasssheets to glass cutting apparatus 25.

After the scoring operation on apparatus 25 the scored glass sheet istransferred to receiving conveyor generally indicated at 31 which passesthe scored glass sheet through a glass snapping apparatus generallyindicated at 32 which runs the cuts along the score lines normal to thepath of travel of the moving glass sheet. From the snapping apparatusthe glass sheet is then transferred to a take-away conveyor generallyindicated at 33 from which it may be transferred to a corner transfertable where the smaller glass sheets from the snapping operation aremoved in a path, parallel to the original path of travel provided byconveyors 27 and 28, so that the score lines of the smaller glass sheetscan be snapped by a glass snapping apparatus. Although conventionalglass snapping apparatus may be used for apparatus 32 and for the glasssnapping apparatus for the other set of parallel score lines, the glasssnapping apparatus of the type disclosed and claimed in copending patentapplication entitled Glass Snapping Apparatus filed on February 15,1960, by Alfred C. Oakes, Wayne W. Cakes and Charles Hatfield, can beused.

The capped glass sheet G is conveyed in the first horizontal path oftravel first by belts 34 of conveyor 27, and then by rings 35 of rubberor other resilient material on shafts (not shown) to constitute conveyorrolls of conveyor 28 onto belts 36 of corner turntable 29. Byconventional means rubber or other resilient rings 38 of conveyor rollsare raised in the conventional manner of operation to move glass sheet Glaterally of its previous path of travel onto conveyor 30 where itsconveyor rolls having shafts with rings 39 of rubber or other resilientmaterial mounted on them transfer sheet G to conveyor 25.

The conveyors 31 and 33 have conveyor rolls, each of which constitutes ashaft having rings 40 and 41, respectively, of rubber or other resilientmaterial mounted on it. The snapping apparatus may have similar conveyorrolls. Of course, various conveyors may be belt conveyors as in the caseof conveyor 27.

The glass cutting apparatus 25 is shown in FIG. 2 without adjacentreceiving conveyor 31 at the left and conveyor 30 at the right wheresome conveyor rolls of conveyor 30 would appear. The cutting apparatus25 has a supporting structure or frame generally indicated at 42. Thecutting apparatus 25 has a conveyor, generally indicated at 43 (FIG. 3),which has a belt 44. The cutting apparatus 25 has a movable cuttingbridge, generally indicated at 45, which is driven by a motor 46 in adirection transversely of the path of travel of the top run of belt 44and has a movable cutter bridge, generally indicated at 47 (FIG. 4),which is driven by a motor 48 in a direction parallel to the top run ofbelt 44. The bridges and 47 support cutter assemblies generallyindicated at 49.

As described later, bridge 47 moves from right to left (as viewed inFIG. 3) from its home position and then reverses its direction to scoreglass sheet G by cutter assemblies 49 on bridge 47 while sheet G isstationary on belt '44. These parallel score lines are referred'to asstrip score lines so that bridge 47 is referred to as a strip cuttingbridge. When bridge 47 returns to its home position, bridge 45 movesfrom right to left (as viewed in FIG. 6) so that its cutter assemblies49 score sheet G after cutter assemblies 49 are lowered by a follower 50riding down on cam'51 (FIG. 6). After cutter assemblies 49 on bridge 45provide the parallel score lines, follower 50 rides up on cam 52 topermit latch arm 53 to hold assemblies 49 in their raised positionduring the re: verse movement of bridge 45 across sheet G to its homeposition.

The bridge 45 is supported in its home position by a short fiat railsupport 54 and by a long guide rail support 55'which are mounted onsupporting structure 42. The guide rail support 55 provides guidingsupport for bridge 45 during its entire travel.- The flat rail support54 provides. the second support for bridge 45 at and adjacent its homeposition. When bridge 45 is away from its home position, a long flatrail support 56 mounted on bridge 47 serves asthe second support duringthe rest of the travel of bridge 45. This occurs while bridge 47 is atits home position. The drive by motor 46 is through gears 57 and 58which mesh with a long rack 59 and a short rack 60 mounted on supportingstructure 42 while bridge 45 is at and adjacent to its home position.Rack 59 is meshed by gear 57 during the full length of travel of bridge45 whereas rack 60 meshes with gear 58 only at and adjacent the homeposition of bridge 45. The gear 58 during the rest of the travel ofbridge 45 meshes with a rack 61 mounted on bridge 47.

Similarly, bridge 47 is supported at and adjacent its home position by ashort fiat rail support 62 and a long guide rail support 63 mounted onsupporting structure 42. The guide rail support 63 providesthe firstsupport for bridge 47 during the full length of travel. The bridge 45has a flat rail support 64 mounted on it so that, at the home positionof bridge 45, rail support 64 provides the second support for bridge 47during its travel away from and towards its home position. Similarly, along rack 65 and a short rack 66 mounted on supporting structure 42engage gears 67 and 68 driven by motor 48 of bridge 47 when the latteris at and adjacent its home position. The rack 65 extends the fulllength of travel of bridge 47 whereas rack 66 does not. However, gear68, upon leaving meshing engagement with rack 66, meshes with a longrack 69 mounted on bridge 45 for continued movement away from and thenfor return movement toward the home position of cutter bridge 47.

The flat rail supports 54 and 56 are at the same elevation and guiderail support 55 is preferably also at this elevation. Each of railsuports 54 and 56 is mitered at one end, as shown near the lowerright-hand corner of FIG. 2, so that when bridge 47 is at its homeposition rail supports 54 and 56 provide in effect a continuous railsupport for one end of bridge 45. Similarly, racks 6t and 61 are in thesame elevation and preferably rack 59 is at this elevation. The racks 60and 61 are mitered at one end in the manner that rail supports 54 and 56are mitered so that when bridge 47 is at its home position racks 60 and61 provide in effect a continuous rack.

The flat rail supports 62 and 64 are at the same elevation andpreferably guide rail support 63 is at this elevation. Each of railsupports 62 and 64 is mitered at one end so that when bridge 45 is atits home position rail supports constitute in effect a continuous railsupport for one end of bridge 47. The racks 66 and 69 are at the sameelevation and preferably rack 65 is at this elevation. The racks 66 and69 are each mitered atone end so that when bridge 45 is at its homepositionracks 66 and 69 constitute in efiect a continuous rack.

The elevation for rail supports 62 and 64 is differentpreferredembodiment the elevation for supports 62 and.

64 is above the elevationof supports 54 and 56. The racks 6t) and 61 areat the different elevation than are racks 66 and 69 and in the preferredembodiment shown in the drawings racks 66 and 69 are at an elevationabove that of racks 60 and 61.

The top run of belt 44 is supported by a table 743. The positioningmechanism generally indicated at 71 of apparatus 25 has a pair of pusherplates 72 which are spaced from each other in the direction of travel ofglass sheet G on belt 44. Each of the pusher plates 72 has a facingblock 73 of micarta or other similar material bolted on its front face.The positioning mechanism 71 when operated moves pusher plates 72 andfacing blocks 73 across belt 44 into engagement with glass sheet G. Theamount of movement thus provided for plates 72 is sufiicient to insurethat both of facing blocks 73 abut glass sheet G and move it at least asmall distance. Of course, this requirement involves the feeding ofglass sheet G onto belt 44 in such a manner that this can beaccomplished. The facing blocks 73 move sheet G to insure thatthisabutted edge of sheet G is properly indexed with respect toapparatus 25.

As described later, apparatus 25 includes electrical circuitry so thatthe trailing edge of sheet G when sattionary on belt 44- is properlyindexed. This is done by controlling the time at which the motor thatdrives belt 44 stops. The leading edge of sheet G when approaching belt44 initiates the drive of bridge 47 from right to left (as viewed inFIG. 2) so that bridge 47 moves at high speed ahead of glass sheet G.Before bridge 47 reaches its maximum position to the left its motor 43changes operation for slow speed drive until bridge 47 reaches itsdesired maximum position away from its home position. Then the drive ofmotor 48 ceases.

When the trailing edge of sheet G passes the position, where the leadingedge was initially sensed before it reaches belt 4-4, the motor drivefor belt 44 ceases, after a delay, for the proper indexing of sheet G.Then positioning mechanism 71 operates to move facing blocks '73 so thatit pushes-sheet G for proper alignment of its edge. As described later,positioning mechanism 71 then retracts pusher plates 72 and the reversedrive of motor 48 at high speed is initiated. With a predeterminednumber of cutter assemblies 49 in scoring position bridge .47 movesacross sheet G to provide parallel score lines.

After bridge 47 passes the trailing edge of sheet G, the electricalcontrol automatically shifts the motor drive of motor 43 to slow speeduntil it reaches its home position where motor 43 is given a torque tomaintain bridge 47 against stop members (not shown) so that bridge 47 isin its home position for alignment of rail supports 54- and es and foralignment of racks 611 and 61.

When bridge 47 reaches its home position, the electrical controlprovides automatically for motor as to operate at high speed to drivebirdge 45 transversely across sheet G. The appropriate cutter assemblies49 on bridge 45 are lowered during this travel to provide paralleltransverse score lines on sheet G and then cutter assemblies :9 areraised to a latched position as described earlier. The bridge 45 isdriven at slow speed by motor until it is driven in the reversedirection at high speed.

Before the reverse drive of motor as for bridge 45 a pair of snappingmechanisms generally indicated at 74 is operated so that each bringsdown its roll 75 onto sheet G. The snapping mechanisms 74 run the cutsalong the score lines closest to the leading and trailing edges of sheetG becausebars 76 and 77 are mounted under belt 44 adjacent these scorelines but between them. Each of bars 76 and 77 extends transversely ofbelt 44. One of bars 76 and 77 is ad iustably mounted by a device 73 formovement of that bar in a horizontal direction normal to itslongitudinal axis. The wheels 75 ride on glass sheet G closer to theleading and trailing edges than the score lines whose cuts are beingrun.

As bridge 45 approaches its home position motor 46 changes to slow speedand the electrical control automatically initiates the drive of conveyor43 so that belt 44 moves the scored glass sheet G from apparatus 25. fcourse, the newly formed trimmed front edge portion falls betweenconveyor 43 and conveyor 31 rather than being transferred to the latter.The same is true for the newly formed trimmed trailing edge portion. Thebridge 45 is moved by motor 46 at slow reverse speed until it reachesits home position where it abuts stop members (not shown). Theelectrical control then provides a slight torque to motor 46 so thatbridge 45 is held against these stop members. 1

The supporting structure 42. has a number or" upright channel irons St)at the front of apparatus 25, a number of upright chwnel irons 81 at therear of apparatus and a pair of upright channel irons 82. at one end.

As seen at the right-hand side of FIG. 3, one of upright channel irons8t) and on of upright channel irons 31 support a transverse horizontalchannel iron 83. The channel irons 82 at the left-hand end of MG. 3support a transverse horizontal channel iron 84. An upright channel iron85 is mounted forwardly of channel irons 31. The channel irons 8t), 82,83, 34 and 85 support a pair of horizontal channel irons 86 and 87 whichare transversely spaced of each other. A number of I-beams 83 aremounted at their ends on channel irons 86 and 87. The I-bearns 88support table 70.

The conveyor belt 44 in its top run slides across the top of table 74?.A pair of bearings 89 is mounted on each end of channel irons as and 87and these bearings 89 rotatably mount pulleys 9t and 91 for rotationabout horizontal transverse axes. A shaft 92 of pulley is driven by amotor means (not shown). The bottom run of belt 44 extends around-pulleys-93 and 94 mounted by bearings 95 and mounted on supportingstructure 42.

A horizontal long channel iron 97 is mounted on upright members 82. Anintegral additional flange 98 extends from the web of channel iron 97inthe direction opposite to the two flanges of the channel construction.The flange 98 extends from the web at a lower elevation than thecenterline of the web, as seen in FIG. 3. A horizontal short channeliron 9 is mounted on upright channel iron 89 (at the right-hand portionof apparatus as viewed in FIG. 2). The channel iron 99 has an integraladditional flan e 16%} positioned relative to the Web of channel iron 99so that flange 1% of channel iron )9 and flange 98 of channel iron 97oppose each other and preferably are at thesame elevation.

The upright channel iron 89 that supports channel iron 99 also sup-portsa horizontal short channel iron 191 having an integral additional flange1G2 extending from the web of channel iron 101 in a direction oppositeto the flanges of the channel iron 161 that define with the Web thechannel construction. The flange 102 extends from the web of channeliron 1&1 at its centerline. The channel irons 99 and 161 are joined toeach other by a bracket 163. The upright channel irons 31 support ahorizontal long channel iron 1 34 which has a construction like that ofchannel iron 161 so that it has an'additional flange 165 which at oneend opposes flange 1% and which is preferably at the same elevation asflange 1G2. The channel iron 10 is connected at one end to one end ofchannel iron 191 by a horizontal channel iron 1:16.

The cutter bridge 45' has end plates 107 and 198. The plates 197 and 103are connected by brackets (not shown) to the ends of channel ironsv1139, 110 and 111 of bridge 45. The channel iron 199 is constructedlike channel iron 161 by having an integral additional flange on whichis mounted fiat rail support 64. Also mounted below this additionalflange, that supports rail support 64, is rack 69 that is secured below(shown in FIG. 2 where the additional flange and rail support 64 arepartially broken away).

The bridge 47 has end plates 113 and 114 which are connected to the endsof channel irons 115, 116 and 117 of bridge 57. The channel iron has anadditional integral flange on which is mounted rail support 56. Theflange on which is mounted rail support 56 also mounts .below it rack 61(shown in FIG. 2 where the additional flange and rail-support 55 arepartially broken away). The construction of channel iron 115 is the sameas that of channel iron 99. The additional flange of channel iron 115 isat the same elevation as the additional flange 1% or" channel iron 99 sothat fiat rail supports 54 and 56 have their top surfaces at the sameelevation as mentioned earlier.

The channel irons 1t and 111 of bridge 45 support motor 46 on a tiltablebracket. By pulley 118 mount ed on the shaft of motor as, belts 119 andpulley 12-3, motor 46 rotates a shaft 121 on Which'pulley 12% is keyed.The shit 121 is journaled adjacent its ends by bearings 122 mounted onend plates 197 and 108. The pinion gears 57 and 58 are keyed on the endsof 7 shaft 121. The bracket supporting motor 46 can be tilted to adjustthe tension of belts 119.

The channel irons 116 and 117 of bridge 47 support motor 48 on atiltable bracket. By pulley 123 mounted on the shaft of motor 46, belts124 and pulley 125, motor 46 rotates a shaft 126 on which pulley 125 iskeyed. The shaft 126 is journaled adjacent it ends by bearings 127mounted on end plates 113 and 114. The pinion gears 67 and 68 are keyedon the ends of shaft 121. The bracket supporting motor 48 can be tiltedto adjust the tension of belts 124. a

The additional flange 128 of channel iron 115 supports rack 61 as wellas rail support 56.

The end plates 1G7, 108, 113 and 114 have integral horizontallyextending flange portions 129 at their ends. Brackets 130 are mounted onflange portions 129 of plate 107. Each of the brackets 130 rotatablysupports rollers or cam followers 131 which rotate about axesapproximately normal to each other. The rollers 131 ride on longitudinalbevelled top surfaces of guide rail support 55. Similarly, a pair ofbrackets 130 is mounted on flange portions 129 of end plate 114 andthese brackets 139 also rotatably support rollers 131 that rotate alsoabout axes inclined to each other. The rollers 131 rest on and movealong the longitudinal bevelled parallel top surfaces of guide railsupport 63. The brackets 132, which are mounted on flange portions 129of end plates 1% and 113, rotatably support rollers 133 which ride alongfiat rail supports 54 and 56 for rollers 133 on end plate 193 of bridge45 and fiat rail supports 62 and 65 for rollers 133 mounted on end plate113 of bridge 47. Cover plates 134 are mounted on end plates 197, 138,

V 113 and 114.

The supporting structure also includes angle irons 135, 136, 137 and138. A pair of plates 139 is mounted on channel iron 86 behind angleirons 136 and 137. Each of plates 139 has mounted emit a bearing 146rotatably mounting a horizontal shaft 141. A link 1 42 is keyed on eachend of shaft 141. Between angle irons 136 and 137 is keyed a link 143 onshaft 141. The link 143 is connected by a bearing 144 to the bifurcatedend of a yoke 145. A pin 146 extends through yoke 145. The bearing 144is mounted on pin 146. As seen in FIG. 3, yoke 145 is connected topiston rod 147 of an air cylinder 143 pivotally mounted on supportingstructure 42.

Each of the links 142 is connected to a pair of links 149 by a pin whichis fixed in position relative to links 149 by taper pins 151' extendingthrough links 149 and into holes in pin 150. A hearing rotatably mountslink 143 on pin 150. The pair of links 149 connected toeach of links 142is connected at the other end to a pin 152 by taper pins 153. Each ofpins 152 is rotatably mounted by a bearing 154 mounted on the underfaceof a guide plate 155. The plate 155 has an upwardly extending tabportion 156 at its other end. The tab portion 156 has a threadedhorizontal hole in which a screw 157 is fixed by a nut 158. Each pusherplate 72 has an offset lower portion which is bolted on guide plate 155by screws 159 which extend through a slot in the lower offset portion ofplate 72. When pusher plate 72 is properly positioned with respect toguide plate'155, screws 159 are tightened. The movement of plate 72 tothe left (as viewed in FIG. 21), when facing blocks 73 are abuttingglass sheet G in a pushing. action,

136 for one of guide plates 1'55 and on angle irons 137 and 138 for theother of guide plates 155. The guide 7 plates 161 are also supported bya horizontal angle iron 162 of supporting structure 42.- Also mounted onplates 161 are cam followers 163 which prevent upward move- '-ment ofguide plates 155. Lateral movement of guide plates is prevented by camfollowers 164 mounted 8 on brackets 165 bolted to plates 161. With thisconstruction is seen that, when piston rod 147 of air cylinder 148 isretracted pusher plates 72 are moved from left to right (as viewed inFIG. 21).

Referring to FIGS. 6 and 8, the end plate 197 of bridge 45 has integralbottom tabs 166, 167 and 163 on which channel irons 109 through 111rest. A support plate 169 is mounted on end plate 107 and it extendsthrough a slot in channel iron 111. A square shaft 170 extends throughplate 169 and is supported by a bearing 171. An actuating arm 172 ismounted on this end of shaft 170 and supports cam follower 50. The latcharm 53 is pivotally mounted on plate 169 and has a notched portion forreceiving one end of arm 172. The latch arm 53 has a earn follower 173at one end. Its other end, which has the notch, is biased downwardly bya spring 174 connected to this end of arm 53 and to plate 169. I

A guide plate 175 is mounted on channel iron 97. The cam 51 is bolted toplate 175. The left-hand end (as viewed in FIGS. 6 and 8) of cam 51 hasa downwardly inclined top surface portion 176. To the left of plate 175is mounted on channel iron 97 a guide bar 177 and a guide 178 betweenwhich slides a bar 179.

The bar 179 at its one end also slides under the top flanged portion'ofguide plate 175; To the left of guide bar 177 is mounted a guide bar 180on channel iron 97 and to the left of guide 178 is mounted another guidebar 181. A hold-down plate 132 is bolted on guide bar 133. The bar 179slides between guide bars 130 and 181 and below hold-down bar 182.

The cutter raising cam 52 is bolted to bar 179 near its left-hand end.The position of cam 52 can be changed from its position shown in fulllines in FIG. 6 to its extreme position to the left as shown in phantomby movement of bar 179 from left to right in the following manner. Abracket 184 is mounted on bar 179 at its righthand end. The two ends ofa chain 185 are connected to bracket 184. The chain 185 extends around asprocket journaled on plate 187 mounted on channel iron 97. The chain135 also extends around a sprocket 188 keyed on a shaft 189 which isjournaled in a support plate 190 mounted on channel iron 97. A crankhandle 191 is keyed on shaft 189. A pin having a handle 192 is biased bya spring (not shown) so that the other end of the pin is betweenadjacent teeth of sprocket 188.

To rotate sprocket 188 an operator pulls on handle 192 to remove the pinhaving handle 192 from between.

TIhis adjacent sprocket teeth and rotates handle 191. moves bar 179 toleft or right, depending upon the rotation of shaft 189. The position ofraising cam 52 is indicated by markings'on plate 190 and a pointer (notshown) mounted on a shaft journaled on plate 19% and on which. a gear193 is keyed. The gear 193 meshes with a gear 194 keyed on shaft 189. 7

When bridge 45 is driven from left to right (as viewed in FIGS. 6 and 8)toward its home position, arm 172 is in the notch in arm 53 so thatfollower 59 is above the plane of the top surface of cam 51 untilfollower 173 rides up on a earn 195 bolted by a bracket to channel iron97. The earn 195 has inclined leading and trailing top surfaces. The cam195 lifts cam follower 173 sufficiently high to pivot latch arm 53 awayfrom actuating arm 172. The arm 172 pivot-s until follower 50 is loweredonto cam 51 where arm 172 is at the position indicated in FIG. 6.

When bridge 45 moves away from its home position to pass over sheet Gfor scoring, follower 59 rides down The bearing 171 is mounted on plate169 by bracket Z V arsi Isa 9 196 which has a flange 197 in which isthreaded a stop screw 193 fixed in position by a nut 199. The stop screw198 limits the counterclockwise pivotal movement of actuating arm 172.

The snapping bars 75 and 77 have been referred to previously as barsthat extend under belt 44 with one of bars 76 and 77 adjustably mountedby device 78 whereas the other bar is fixed in position. In FIG. 3 bar76 is fixed in position by brackets 26%) mounted on the longitudinaldownwardly extending flanges of table 79. The ends of bar 77 areconnected to brackets 29]. of device 78. Each of brackets 201 isconnected to a bar 202 which is mounted on a rack 223 (not shown) thatengages a gear 284 keyed on a shaft 205 rotated by a handle 296. Theshaft 2135 extends under table 79 and is supported by bemings (notshown) mounted on table 76. The bars 292 are supported by and movewithin a guide 2tl7. Each of bars 292 has a threaded aperture forreceiving a screw 208 on which is threaded a nut 22?. Below not 209 is asmall plate that abuts the top of guide 207. The nuts 209 are loosenedfor adjustment of bar 77. The handle 2% is turned until bar 77 isproperly positioned to be adjacent the expected last score line on sheetG but between that score line and the next score line. The nut 209 istightened to fix guide bar 282 in position.

Referring to FIG. 15, the channel iron 111 of movable bridge 45 supportsa bracket Ziil. The bracket 21%) has a bottom gusset 211. Two of plates212 are mounted on bracket 21% and support an air cylinder 213. Hoses214 and 215 communicate with the upper and lower chambers, respectively,of air cylinder 213. The other plate 212 supports a guide 216 throughwhich slides a plunger plate 217 for vertical movement. The piston rod218 extends into a top recess of plunger plate 217 and is secured to itby a taper pin 229. The top end of plunger plate 217 has a flange 22%.The top of guide 216 has a flange 221 below flange 22% of plunger plate217. A stud 222 is threaded in flange 221 and is adjustabiy fixed inposition by a nut 223. The stud 222 limits the lowering movement ofplunger plate 217 by air cylinder 213.

A pin 224 extends through the bottom portion of plunger plate 217 and isfixed in position by a screw 225. The bearing-containing wheel 75 isjournaled on pin 224 between a pair of washers 227, one of which restsagainst the shoulder of pin 22 The wheel 75 is held on pin 224 by acotter pin 223. The wheel is shown in full lines in FIG. 15 in itsraised position and in phantom its lowered position is shown when it ison glass sheet G during the return travel of bridge 45.

In HG. 3 the two Wheels 75 are shown spaced above glass sheet G at itsends; Only the bottom portion of each of wheels 75 is shown. The wheels75 are positioned between the end cutters and the adjacent edges ofsheet G. The centerlines of plunger plates 217 are in the verticaltransverse planes of the cutters of the end assemblies 49.

As seen at the top leftand right-hand ends of FIG. 3, a pair of mountingbrackets generally indicated at 229 is mounted on channel iron 111 ofbridge 45. A similar mounting bracket 229 is on channel iron 116 ofbridge 47. As seen in FIG. 11, the mounting bracket 229 has spacedupwardly extending arms 23% and 231. ,l-lori- 'zontal apertures extendthrough arm 3% and are in alignment with horizontal recesses in arm 231L provide supports for horizontal pins 232 in vertical alignment. The an231 has apertures normal to the recesses in arm 231 and these supportstuds 233 which areiixed in position by snap rings 234 on each side ofarm 231. The-rings 234 are snapped into peripheral grooves in studs 233.Adjusting blocks 2.35am threaded on studs 233. Because of the thicknessof adjusting blocks 233, they are in a vertical staggered relationshipto one 'another, as seen in E16. 10. Each of adjusting blocks 235 has asquare aperture through which extends an adjustone end in arm 2521 1%ing bar 236. Each of adjusting bars 236 is supported also by one of pins232. At the other end each of bars 236 has a pair of cars 237.

Each of the adjusting blocks 235 has a hole normal to and communicatingwith its square aperture that receives adjusting bar 235. In this holeis a plunger 233 which is biased inwardly by a compression spring 239.The spring is held in the hole by a snap ring 249 in a circular grooveadjacent the entrance to the hole. The other end of spring 239 abuts ashoulder of plunger 238. The one end of plunger 238 is thus biased intothe square aperture through which passes 'bar 236. This end of plunger238 extends into one of a number of recesses 241. The distance betweenadjacent recesses 241 is a unit of length. The glass sheets are cut todimensions which are multiples of this unit of length.

Each of the bars 236 is adjusted to reposition an associated cutterassembly 49 by mov ng bar 236 from left to right (as viewed in FIGSJIOor 11) after first pulling out plunger 238 from one of recesses 241.When the next desired position of bar 236 is attained, plunger 238 isallowed to return to its spring-biased position in opposng recess 241.Bars 236 are of different lengths for each Mounted on the web of channeliron 111 of bridge E5 is a plate 242 that extends substantially theentire length channel iron 111. Each of cutter assemblies 49 has a backpla.e 243. Reference is made to FIGS. 12-19 which show the constructionof an end one of cutter assemblies in its association with one of wheelsand bridge 45. Of course, the cutter assemblies for bridge 47 aresimilarly constructed in this preferred embodiment. The plate 243 has atits top portion a number of apertures that are in a vertical row. Theears 237 of one of bars 2% abut plate 243 and apertures in cars 237 arein alignment with one of apertures 244. A nut and bolt (not shown)through these apertures are used to'connect ems 237 to plate 243.

The lower portion of back plate 243 has recessed portion which abutsplate 242. The top edge of plate 242 and the opposing top horizontaledge of the recessed portion of back plate 243 are inclined with respectto each other to receive a wedge 245 between these surfaces. The wedge245 has an aperture through which extends a bolt 245 which is threadedinto plate 243. The bolt 24% has a shoulder 24-7 which moves wedge 245toward the inclined surfaces so that, when bolt 246 is tightened, wedge245 is held tight against plate 24-2 and back plate 243.

The recess in plate 2 :3 results in a bottom flange having verticalthreaded apertures in'which are placed screws A stop or gib 249 isplaced between screws 248 and the bottom edge of plate 242 which isinclined as is the top surface of gib 249. The gib 243 is bolted to backplate Thus gib 242, which prevents any tilting action of cutter assembly49, insures vertical alignment of the latter.

Each of the cutter assemblies 49 has a plunger 259. bottom end ofplunger 25% is welded to a spring clamp suppo t 251. A cutter arm yoke252 is welded to clamp support 251. Through the bifurcated arms of yoke252 extends a pin 253 which is journaled in bearings 254 in yoke 5'2. Astop screw 255 is threaded horizontally in the top portion'of yoke 232.a

A cutter holder arm 255 is fixed on pin 253 by a set screw 25?. The arm256 extends between the bifurcated arms of yoke 252. A spring 253 isconnected to one end of arm 25s. A turret cutter holder 259 is mountedon the other end of arm 256 by a pin 25% which is threaded at Betweenthe knob of pin 268 and turret holder 259 is a spring 261 that abuts theknob and a washer 2 52.

The turret holder 2-59 has a number grooves i which are mounted glasscutter a corn/er nal manner wifln spring clips The turret holder 259 hasa number of i or" peripheral wheels 253 in (not shown). apertures 2124which are arranged in a circle about the axis of pin 260. A pin 265ismounted on cutter arm 256 in a position so that it extends into one ofapertures 264. Thus an operator can easily move turret holder 259 awayfrom arm 256 to permit rotation of cutter heads 263 and then when turretholder 259 is released spring 251 will force it against arm 256. Ofcourse, this is done when another one of apertures 264 is in alignmentwith pin 265. This positions a different cutter wheel 263 to score theglass sheet when cutter assembly 49 is lowered onto sheet G.

The spring 258 is connected at its other end to a clamp support 266connected by a bolt 267 to a spring adjuster block 268 bolted to the topend of spring clamp support 251 at its top end. Thus spring adjusterblock 268 moves up and down with plunger 250. The spring 258 biasesturret cutter 259 downwardly. This downward force is limited by a tab269 on arm 256 abutting limit screw 255 mounted in yoke 252.

In addition to pin 265, the one end of arm 256 has a pin 271 extendingfrom the opposite vertical face of arm 256. A lifting bar 272 has at itstop end a bifurcated horizontal flange 273 which is joined by aconnecting bar 274 to a shaft 275 of a solenoid 276.

The lifting bar 272 has its main vertical portion sliding between aguide 277 and a guide cover plate 278 which are bolted to a housingmember 279 through a housing member 286. The housing members 279 and 28%enclose the central portion of plunger 259 and provide a verticalaperture which corresponds in cross section to a the central portion ofplunger which has four vertical ribs equally spaced from one another.The housing member 239 is also bolted to housing member 279 which isbolted to plate 243. V

The solenoid 276 is mounted on a plate 281. A clamp block 282 (FIG. 12)pivotally supports plate 281 by a bolt 283. The clamp block 282 ismounted on one vertical side of plate 243. A clamp block 284 (FIG. 17)is bolted on the other vertical edge of plate 243. A wing bolt 235extends through a notch 235 in plate 281 and into block 284. The wingbolt 285 holds plate 231 against clamp block 284. By loosening wing bolt285 plate 281 can be pivoted about bolt 283 to swing solenoid 276 out ofthe way after its shaft 275 is disconnected from bar 274. The solenoid276 can be disconnected from plate 281 and replaced by another solenoid.Then plate 281 is pivoted to the position where its shaft 275 isconnected to bar 274. The wing bolt is tightened.

'The top end of plunger 25% is threaded into a yoke block 287 which hasa horizontal aperture in alignment with the apertures in the bottombifurcated ends of a plunger yoke 233 for receiving a connecting bar 289The shaft of bar 289 has a peripheralgroove which is engaged by the endof a spring plunger 29% mounted in yoke block 287. By this constructionplunger 25% is connected to plunger yoke 288 but they are readilydisconnected from yoke 28% by pulling on phinger 2%.

' The top of plunger yoke 233'has a vertical aperture in' which isthreaded an adjusting screw 291 which can be iixed by a nut 292. Theshank of adjusting screw 291 has a peripheral groove adjacent its headso that screw 291 supportsan adjusting screw block 293. With thisconstruction the block 293 is adjustably fixed in position between thebifurcated arms of plunger yoke 233.

Plates 294 and 295 are bolted on the vertical sides of plate 243 withplunger yoke 288 between them. The plates 294 and 295 have alignedapertures to receive a pin 2% between them. The pin 2% pivotallysupports a retaining arm 297 which is bifurcated at'its top end tosupport between these bifurcated ends a roller. 298. Each of thebifurcated ends of arm 297 has connected to it a spring 299. The otherends of springs 299are connected to plates 294 and 295; Thus roller 293is springbiased'toward a roller block mounted on the 'top por- .tion of.plunger yoke 288. The retaining arm 297'pivotally supports a screw 3G1(FlG. 18) which'isthr'eaded 12 into a switch 302 which has an arm 333 onwhich is mounted a handle 3%. A spring plunger 3% is mounted on switch3&2. The retaining arm 297 has two recesses which are disposed in an arcabout the pivot axis of screw 301. The spring plunger 305 retains switch302 in one of two positions depending upon the recess of retaining arm297 in which spring plunger 305 is positioned. The plunger 305 is movedout of this position and switch 3&2 pivoted to the other position bymovement of arm 303.

The switch 3112 has an inclined surface 306 so that as switch 302 ispivoted the inclined cam surface 306 moves along an edge of plate 294.As a result, in one pivotal position of switch 302 retaining arm 297 isin the position shown in FIG. 12 and in full lines in FIG. 16, whereasin the other pivotal position of switch 302 (shown in phantom in FIG. 16and in full lines in FIG. 18) springs 299 move retaining arm 297 toposition roller 298 below roller block 39%. In the latter position rollr 298 prevents lowering of block 3% and thus prevents lowering ofplunger yoke 288. A roller 307 below block 293 is rotatably mounted on apin 3G8 mounted on a bifurcated end of a lifting arm 3&9. The arm 369 ismounted on square shaft 170 for pivot with rotation of shaft 174). Theplates 29 and 295 support roller bearings 31% which abut plunger yoke283. V The plunger 250 is biased downwardly by a spring 311 enclosedwithin guide housings 279 and 28% When bridge is at its home positionwith follower 5 resting on cam 51, lifting arm 39 is in the positionshown in FIGS. 12 and 18. As bridge 45 moves away from its home positionfollower rides down on inclined surface 176, actuating arm 172 ivots torotate square shaft counterclockwise (as viewed in FIGS. 12 and 18)lowering roller 357 so that block 293, plunger yoke 288 and plunger 251)are lowered thereby lowering cutter wheel 263 onto glass sheet G intoscoring position. This occurs so long as roller 298 is not directlybelow block 320. However, when roller 293 is directly below block 360with switch 302 in the position shown in FIG. 18, the lowering of cutterwheel 263 is prevented.

An operator determines which cutter assemblies 49 are to be used for ascoring operation on glass sheet G by a proper positioning of switches302. When an operator wishes to cancel, for an individual scoringoperation, ,7 one of cutter assemblies 49 either on bridge 45 or bridge'47, solenoid 276 of cutter assembly 49 to be cancelled fromoperation'is energized byclosing an electrical circuit (not shown). The'energization of this solenoid 276 lifts shaft 275 thereby lifting arm272 so that when square shaft 170 is rotated to lower plunger 250 pin271 is lowered into abutment with raised arm 272. The arm 272 preventsfurther lowering of turret cutter 259 and the end of arm 256 on whichturret cutter 259 is mounted. Then arm 256 pivots about pin 253. Thisprevents cutter wheel 263 from engaging glass sheetG. This is atemporary means for keeping a particular cutter assembly from engagingin a scoring operation. When it is desired to prevent a particularcutter assembly 49from being used in a series of scoring operations, itis preferable to pivot switch 362 to the position shown in FIG. 18rather than rely upon continued energization of solenoid 276 of thatcutter assembly 49. i

Referring to FIG. 22, electrical lines L1 and L2 are connected to allO-volt A.C. source (not shown). The.

various circuits connected to lines L1 and L2 contain either a coil of arelay, an electric timer or a solenoid of a solenoid-operated,spring-biased, 4-way valve. The coils are designated IFSM, iRSM, 2RSM,'FcM, iRcM,

ZRCM, BCM; BCT, BCBC,'1TCR, ICR, ZTCR, ZCR,

9CR. The electronic timeris designated ETCR. The

has contacts 3-1TCR, 32TCR and 3-3TCR. having coil 30R has contacts3-1CR, 3-2CR, 33R,

7 13 having coil IRSM has contacts 1-1RSM, 1-2RSM, 1-3RSM, 14RSM, lRSM,1-6RSM, 1'7RSM, 1-8RSM and 1-9RSM. The relay having coil ZRSM hascontacts 2'1RSM, 2-2RSM, 2-3RSM, 2-4RSM, 2-5RSM and 2-6RSM. The relayhaving coil lFCM has contacts 11FCM, 12FCM, 1-3FCM, l4FCM, I-SPCM, and1-6FCM. The relay having coil IRCM has contacts 11RCM,'12RCM, 1-3RCM,1-4RCM, and l5RCM. The relay having coil ZRCM has contacts 2-1RCM. Therelay having coil BCM has contacts 1-1BCM and 1 2BCM. The relay of theoil-delay type having coil BCT has contacts 1-1BCT and 1-2BCT. The relayhaving coil BCBC has contacts 1-lBCBC and 12BCBC. The timer relay of theon-delay type having coil lTCR-has a contact (not shown) which isreferred to later. The relay'having coil 16R has contacts 1-1CR, 12CR,1-3CR and l-CR. The timer relay of the off-delay type having coil -2TCRhas a contact 21TC-R. The electronic timer 'ETCR has a contact 11ETCR.The relay having coil ZCR has contacts 21CR, Z-ZCR, 23CR and 24CR.Thetimer relay of the on-delay type having coil STCR The relay '3-4CRand 3-5CR. The timer relay oi the on-delay type having coil 4TCR has acontact 4iTCR. The relays having coils 4CR, SCR, 60R, 7CR and 80R havecontactsd-TCR, 4-2CR and 4-3CR, 51CR and 5-2CR, 6 -1CR, 6-2CR, 63CR and64-CR, 7-1CR, 7-2CR and 7-3CR, and S-TLCR, respectively.

The ma 1FSM is in a circuit between lines L1 and L2 'in series withnormally open contact llCR, normally closed contact 2-1CR, a normallyclosed contact 1-118 of a limit switch 118, normally open contact 4-lCR,normally closed contact Z-lRSM and normally closed contact l-lRSM.This'circuit, except for contacts 146R andZ lCR, is also connected toline L1 by a normally open contact 11FSM which provides a holding subcincult for coil IFSM when contact fl-lCR opens.

Another circuit between lines L1 and L2 contains coil 1RSM in serieswith a normally open contact 1-2LS of switch 115, normally closed,time-opening contact 3-1TCR, normally closed contact 3-1CR, and normallyclosed contact 12FSM. The normally open contact 1-2RSM is in aholdingsubcircuit for coil lRSM. This *snbcircuit is in parallel with contactI-ZLS and contact of the previously mentioned circuits that containscoil lRSM and contacts 3-lCR and 12FSM and the portion of anotherpreviously mentioned circuits that contains coil ZRSM and contact 3-3CRare connected to this circuit through normally open cont ct 1-1FCM sothat when contacts 13FSM, 3-4CR, Z-ZCR, *51CR and 1-1FCM are closed,current can flow to these portions of the previously mentioned circuits.

The coil lRCM is in another circuit in series with normally open contact3CR, normally open, time-closing contact 4-1TCR, normally closed contactl-ZFCM aiidnormally closed contact l-ZCR. in parallel with contact 4-2CRand coil lRCM is a suocircuit containing in' series normally opencontact 4-3CR and coil ZRClv In parallel with'contacts 3-5CR and 4-1TCRis normally open contact 1-4l5SM in one su'ocircuit and normally opencontact 1-3RSM in a second subcircuit. The cofls l'PChi, ERCM and ZRCMare connected to home position.

l4 line L2 through a pair of normally closed contacts 0L which are in asafety overload relay.

The coil BCM, which is the coil of a starter relay for the motor thatdrives belt 44, is in a circuit in series with a normally open limitswitch 218 and normally closed contacts 2-3CR and l1BCBC. lri parallelwith coil BCM is coil BCT so that it is energized when coil BCM isenergized. The coil BCBC is in a relay for the braking coil for themotor which is operated by the energizetion of coil BCM. When coil BCMis deenergized and coil BCBC is energized, this motor promptly stops toindex properly glass sheet G as described later. The coil BCBC is in acircuit containing normally open, tirneopening contact l-1BCT andnormally closed contact 1-2BCT. The coils BCM, BCT and BCBC areconnected to line L2 through a pair of contacts OL of a safety overloadrelay.

The coil lTCR is in a circuit in series with normally closed contactl-lBCM.

The coil lCR is in a circuit in series with normally Open contacts 318,4L3 and SL5 which are in the path of travel of glass sheet G so thatthey are closed by the sheet just before it reaches 'oelt d4. Of course,switches 3 .S, 4L8 and SLS remain closed until the trailing edge ofsheet G passes beyond these switches which are spaced from one anothertransversely of this path of travel of sheet G.

The coil ZTC is in a circuit in series with normally open contact l2.CR.

The timer ETCR is connected to line L2 by line L3 and is connected toline L1 by line L4 for power operation or" timer E CR and also connectedto line L1 through a circuit containin normally closed contact 1-3CR,which when closed initiates the operation of timer ETCR for a period oftime at the end of which normally open contact llET(3R of thetime-closing type is closed.

The coil 'ZCR is in a circuit in series with contact 1-lETCR, mentionedabove, normally closed contact l-4CR, normally open, time-openingcontact 2lTCR and normally closed contact 5-2CR. The normally opencontact 2-4CR is in a holding subcircuit in parallel with contactsl-IETCR, 1-4CR and Z-lTCR.

The coil STCR is in a circuit in series with normally open contactZSFSMI and a normally closed limit switch 615. The switch 618 (H88. 20and 21) is opened by pusher plates 72 when the latter has moved itsmaximum distance for the movement of glass sheet G in the squaringoperation. In parallel with contact l-SFSM is normally open contact3-2TR in a holding subcircuit.

The solenoid 15V is in acircuit in series with normally open,time-closing contact E-STCR, normally closed contact 1ZBCMand normallyopen'contact l2BCBC.

The coils SCR and TCR arein parallel with each other and are in serieswith a normally open limit switch FLS in another circuit between linesL1 and L2. The

' switch 7L5 is tripped closed by bridge 4'7 when the latter is at itshome position.

The coil 4611 is in a circuit in series with a normally open limitswitch 8L5 which is closed when bridge is is at its home position. Anormally open push-button switch 1P3 is in parallel with switch 31.8 andin series with coil if/R.

The coil SCR is in a circuit in series with a normally open limit switch9L8 which is tripped closed by bridge l5 after it has moved away fromits home position to a position beyond the scoring operation on glasssheet G. The energization of coil 5C3 indicates that the cross scoringor cutting has been completed and stops the movemerit-or" bridge 455away from its home position.

The coil 6CR is in a circuit in series with normally closedCOntact'LlCR, a normally closed contact ill-Ellis of a limit switchlliLS and normally open contact 16PSM. fore it has completed its maximumtravel away from its in parallel with contacts l-flFSi/I and ltl lLS butin series with contacts 1 103. and coil li-CR The switch it'l -LS istripped by bridge 47 beare three subcircuits. One of these subcircuitsincludes in series normally open contact l-4RSM and a normally closedcontact 11-1LS of a limit switch llLS which is opened when bridge 47 hasalmost reached its home position in its return movement. The secondsubcircuit has normally open contact 1-3FCM and a normally closedcontact 12lLS of a limit switch IZLS which is tripped when bridge 45 hasalmost reached its maximum desired position of travel away from its homeposition. The third subcircuit contains normally open contact 1-3RCM anda normally closed contact 13415 of a limit switch 1318 which is openedwhen bridge 45 almost reaches its home position in its return travel.

The coil 7CR is in a circuit in series with normally closed contact61CR, normally open contact 17FSM and a normally open contact ltl-ZLS ofswitch 191.5. In parallel with contacts 1-7FSM and 10-2LS are threesubci cuits which are in series with contact 61CR and coil 7CR. One ofthese subcircuits has a normally open contact 15RSM and a normally opencontact 11-215 of switch liLS. The second subcircuit has normally opencontact 1-4FCM and a normally open contact 122LS of switch IZLS. Thethird subcircuit has normally open contact 14RCM and a normally opencontact 13-215 of switch 13LS.

The solenoid ZSV is in a circuit in series with normally open contactsl-EFCM and 6-2CR.

The solenoid 38V is in a circuit in series with normally open contact15RCM.

The coil SCR and solenoid 43V are in parallel with each other and bothare in series with a normally closed limit switch 14LS, normally opencontact 1-6RSM and a normally open limit switch ESLS. In parallel withswitch 15LS is normally open contact 3-1CR in a holding subcircuit forcoil 8CR.

The apparatus, as seen in FIG. 23, is provided with an alternatingcurrent motor M that drives a DC. generator DCG and an alternatingcurrent exciter E. The motor M is connected by electrical lines L6, L7and L8 through normally open contacts Ill-1CR of a starter coil relay toa 440-volt A.C. power source. The strip cut drive motor 48 has anarmature 48A and a series field 4885'. Direct current from generator DCGpasses through a circuit having armature 48A of drive motor 43, seriesfield 485? of motor 48 and contacts when all of the contacts in thiscircuit are all closed. The flow of current through series field 435? isalways in the same direction. The direction of flow of current througharmature 48A is dependent upon which subcircuit is utilized.

When the relay for coil IFSM is energized, normally open contacts 1-8FSMand 1-9FSM close so that the flow of current through armature 48Aoperates the motor for forward drive of bridge 47 away from its homeposition. When the relay having coil IRSM is energized, normally opencontacts 1-7RSM and 1-8RSM close so that the flow of the current througharmature 48A is in the opposite direction.

The speed of operation of motor 48 is dependent upon the flow of currentthrough armature 48A and series field 438E The same is true for motor46, i.e., its speed depends on current flow through its armature 46A andseries IRSM is energized.

The. circuit from generator DCG through armature 48A and series field48SF of strip cut drive motor 48 has normallyclosed contact Z -ZRSMbetween series fieldv 48SF and generator DCG and has normally closedcontact J 2 3RSM between series field 48SF and armature 48A.

16 These contacts 2-2RSM and 2-3RSM are present in the circuit to insurethat generator DCG cannot operate strip cut drive motor 43 when bridge47 is at its home position until another glass sheet G, sensed by limitswitches 3LS, 4LS and SLS, is being moved toward the cutting position byfeeding conveyor 39.

The generator DCG provides a constant voltage which may be one of twopredetermined voltages. The voltage provided by generator DCG isdependent upon the alternating current flow through the general fieldwinding GF of generator DCG. Which one of the two voltages is determinedby which one of coils 6CR and 7CR is energized as explained below. Thefiled winding GF' is connected to one terminal of exciter E through anyone of four normally open contacts 110FSM, 1-QRSM,

12FCM and 1-2RCM. These four contacts are in parallel with one another.Thus the field winding GF of DC. generator DCG is not provided with A.C.current unless any one of coils IFSM, IRSM, IFCM and lRCM is energized.The field winding GF of generator DCG is connected. to the otherterminal of eXciter B through two parallel circuits, one of which has inseries normally open contacts 6-3CR and 64CR and a variable rheostatlVR. The other parallel circuit connecting field winding GP of generatorDCG has in series normally open contacts 7-2CR and 7-3CR, a variablerheostat 2VR and a resistor lRe. A resistor 2Re connects winding GP tothese two parallel circuits.

With any one of coils IFSM, iRSM, IFCM and lRCM energized and with coil6CR energized to close contacts 6-3CR and 6-4CR alternating current flowthrough generator DCG field winding GF is predetermined by the positionof the variable rheostat IVR. This current flow determines the voltageof generator DCG to armature 48A or 46A and series field 48SF or 46SF.When contacts 7-2CR and 7-3CR close, current instead flows throughrheostat ZVR and resistor lRe, so that there is less current flowthrough field winding GF of generator DCG than when coil 6CR isenergized. Then a lower voltage is applied to the circuit containingarmature 48A and series field 488E of the strip cut drive motor 48 ifone of coils EFSM and IRSM is energized instead of one of coils IFCM andlRCM.

The exciter B provides alternating current continuously to the shuntfields 48SF and 46SF of the strip cutdrive motor 48 and the cross cutdrive motor 46, respectively,

because circuits for these shunt fields contain no contacts.

The DC. generator DCG is also connected in a circuit having the seriesfield winding 46SF of the cross cut drive motor and its armature inseries in circuits which are constructed as described above for armature48A and series field 48SF so that the how of current througharmature 46Aof motor 46 is in one direction or the other, de-

pendent upon which one of coils IFCM and IRCM is energized. Of course,this current from generator DCG flows in one direction through fieldwinding 46SF regardless of the direction of flow through armature 46A ofstrip cut drive motor 46.

From the foregoing description it'is apparent that the energization ofeither coil 6CR or coil 7CR determines the parallel circuit containing avariable rheostat which is utilized to provide current fiow throughgeneral field winding GF of generator DCG. Thus the energization ofeither coil 6CR or coil 7CR determines the speed of operation of eitherstrip cut drive motor 48 or cross cut drive motor 46. The direction ofrotation of armature 48A of strip cut drive motor 48 depends on whichone of coils lFSM and IRSM. is energized. Similarly the direc-.

tion of rotation of armature 46A of cross cut drive motor 46 dependsupon whichone of coils IFCM and 1RCM is energized. If neither one ofcoils IFSM and IRSM is enefgiZfid, the generator does not operate .stripcut drive motor 48.

Similarly if neither one of coils IFCM and IRCM is energized, thegenerator does not drive cross 17 cut motor 46 by flow through armature46A and series field winding 468R Each of the two termin s of armature48A is connected also to a low voltage 110. source through lines L9 andL19 and normally open contacts 2-4RSM and 2-5RSM so that current flowsfrom the DC. source only when coil ZRSM is energized. This occurs afterthe strip cutting bridge 47 returns to its home position. Thisconnection of armature 48A to the D.C. source provides a slight torquein the reverse direction to motor 48 by current flow through thearmature. This holds bridge 47 against the stop members at its homeposition as mentioned earlier. The armature 45A of cross cut drive motor46 is similarly connected to a DC. source through electrical lines andnormally open contacts 2-2RCM and 2-3RCM (both not shown) so that crosscutting bridge 45 is maintained at its home position upon its returnfrom the cross cutting operation. This 11C. source provides a flow ofDC. current in a correct direction when contacts 22RCM and 23RCM areclosed by the energization of coil ZRCM.

Parallel to armature 48A of motor .8 is a subcircuit containing inseries a resistor 3R2 and normally closed contacts 1-1EFSM, 1-10RSM and2-5RSM. This is a safety subcircuit that has one of these normallyclosed contacts open at any given time, except when the entire apparatusis being shut down. At that time the induced voltage of motor 48 must bedissipated and this is accomplished by this subcircuit. There is asimilar subcircuit in parallel with armature 4 6A and it contains inseries normally closed contacts of reiays having coils IFCM, IRCM andZRCM.

A bracket 31?. is mounted on the left-hand end of channel iron 199 (asviewed in FIG. 2). The bracket 312 supports cams 313, 334 and 315. Thechannel iron 115 of bridge 47 supports a cam 315. As shown in FIG. 2,limit switches 1L8, 21S and 718 through TSLS are mounted on supportingstructure 45.

The switch 815 is ciosed by bridge 45 when the latter is at its homeposition. When bridge 47 approaches its extreme left-hand position oftravel, cam 316 trips switch EELS and then trips switch 1L8. In thereturn travel bridge 47 trips and closes switch 15LS. Before bridge :7reaches its home position it trips and opens switch 14LS.

When bridge 45 moves beyond belt 44 after cutter wheels 26?: have passedsheet G, can 313 trips switch 1218. Shortly thereafter cam 313 tripsswitch 9L8 to close it for a brief period of time. During the returntravel r" bridge 45 cam 315 trips switch ISLS to change the drive ofbridge 45 to slow speed. Just before bridge 45 reaches its home positionto close switch 8L8, cam 32% trips and closes switch 21.5.

The switches 3L5 through SLS are shown only in FIG. 22. They are mountedto be tripped by sheet G just before it reaches belt 44. The switch dLSis mounted on plate 161 and is tripped open by pusher plate 72 as itmoves forward in pushing sheet G.

The square bar 17s on bridge 47, that is rotated to lower cutterassemblies 49 on that bridge, is connected at one end to an air cylinder317 by a crank arm 3118 connected to piston rod 319 of cylinder 317. Theactuation of cylinder 317 results in the rotation of this square shaft.

Operation Assume that contacts iii-10R are closed so that A.C. motor Mis operating. Assume that bridge 45 and 47 are at their home positionsso that switches 2L5, 7LS and 8L8 are closed. The switch 9L8 is open.The contact 1-1LS is closed and contact 1-2LS is open. The switches 3L5,LS and 518 are open, because it is assumed at the start that a glasssheet G is not being fed to conveyor 25. The positioning mechanism 71 isat its home position so that limit switch 61.8, which is not tripped byone of pusher plates '72, is closed. The switches 1315 through 13LS havecontacts 161LS, 111LS, 1241.8 and 13-113 18 closed and contacts MLZLS, 12LS, i22LS and 13-2LS open. The switch 141.5 is closed and switch 15LSis open.

Because switch 215 and contacts 2-3CR and 1-1BCBC are closed, coils BCMand BCT are energized. With coil BCM energized the motor for c nveyor 25is operating so that belt 44 is moving across table 70.

Because coil BCM is energized, contact LTBCM is closed and thus coiliTCR is energized. The relay having coil ITCR has a normally opencontact of the on-delay or time-closing type (not shown) in anelectrical circuit (not shown) that controls the operation of the motorfor driving feeding conveyor 3:). It is necessary for this contact to beclosed f conveyor 39 to operate. It is assumed that the delay period ofthis contact has expired so that the contact is closed and conveyor 30is operating. As described later, coil BCM is deenergized prior to thescoring operations by cutter assemblies 49 on bridges 45 and 47 andremains deenergized during these scoring operations.

With coil BCT energized, contact 1-1BCT is closed but contact f.2BCT isopen so that coil BCBC is not energized. The contacts 3-3TCR, T-ZBCM andl-ZBCBC are open so that solenoid RSV is not energized. Also contact11BCBC is closed.

Because switches 318 through 5128 are open, coil ECR is not energized.The contacts 1-llCR and 1-2CR are open, so that coils TFSM and ZTCR arenot energized. However, contact 1-3CR is closed so that electronic timerETR is operating and contact 1-1ETCR is closed. Although contact 1-4CRis closed along with contacts T-EETCR and 52QR, contact Z-TTCR is openso that coil ZCR is not energized. The contact 2-1TCR is open becausecoil ZTCR is not energized. The contact 5-2CR is closed because coil 5CRis not energized due to the fact that switch 918 is open. Accordingly,only contact 2-1TCR is preventing energization of coil ZCR.

Because switches 7L3 and 818 are closed, coils 3CR, TCR and 40R areenergized. With coil tCR energized contact 4-1CR is closed. The coilsIRSM and ZRSM are not energized, for the reason presented below, so thatcontacts r-TRSM and 2-1RSM are closed. As mentioned earlier, contact1-1LS is closed. Because coil ZCR is not energized, contact 21CR isclosed. Thus in the circuit containing coil IFSM only contact 11CR isopen. Thus coil iFSM is not energized. The contact 1-1FSM in its holdingcircuit is open.

Because coil ilFSM is not energized, contact 1-2FSM is closed. Thecontact 1-5FSM in the circuit with coil 3TCR is open because coil TFSMis not energized. Thus coil STCR is not energized, even though switch6L8 is closed. The contact 3iTCR is closed. However, contact 1-2LS isopen. Also contact S-lCR is open because coil SCR is energized withswitch 7L3 closed. Accordingly, coil ERSM is not energized and thuscontact 1-2RSM in its holding circuit is open.

Viith coil 36?. energized contact 3-3CR is closed. However, with contact1-2LS being open, coil ZRSM is not energized even though contact 31TCRis closed. With coil SCR energized contact S-ZCR is closed but contactTJRQM is open because coil lRCM is not energized a explained below. Thusthe circuit that contains contacts 32CR, 1-1RCM and 33CR cannot energizecoil ZRSM at this time.

in the circuit containing coil lFCM, contact 13FSM is ciosed becausecoil IFSM is not energized. in the circuit contact 3 CR is closedbecause coil SCR is energized. Contact 5-1CR is closed because coilSt'JR is not energized at this time. However, contact 2-2CR is openbecause coil ZCR is not energized. The contacts 12RCM and 2-1RCM areclosed and open, respectively, because coil lRCM is not energized andcoil ZRCM is energized. The coil TFCM is not energized because contactsZ-ZCR and 2-1RQM are open.

Because coil TPCM is not energized, contact i-TFCM 19 is open so thateven if contact 2-2CR were closed coil ZRSM could n t be energized atthis time.

In the circuit containing coil IRCM, contact 35CR is closed because coil3CR is energized. The coil 4TCR is also energized. It is assumed thatthe apparatus has been operating for a period of time beyond the delayperiod of contact 4-1TCR so that the latter is closed. Because coil IFCMis n t energized, contact 1-2FCM is closed. Because coil 4CR isenergized, contact 4-2CR is open. This prevents energization of coilIRCM. However, contact 4-3CR is closed so that coil ZRCM is energized.Because coil IFSM is not energized, contact 1-4FSM is open. Because coilIRSM is not energized, contact 1-3RSM is open. The contacts 3-5CR and4-1TCR open when bridge 47 leaves its home position because switch 7LSopens. At this time contact 1-4FSM closes to keep coil ZRCM energized.When contact 14FSM opens, contact 1-3RSM closes to keep coil ZRCMenergized until contact 1-2FCM opens, as described later.

Because none of c ils l FSM, lRSM, lFCM and lRCM is energized, contacts1-6FSM, l iRsM, 1-3FCM and 1-3RCM are open. The contacts 1tl1LS, 111LS,121LS, 131LS and contact 71CR are closed. Coil son is not energized andcontact 61CR is closed. The contacts 1-7FSM, 1SRSM, 1-4FCM and 1-4RCMand contacts l02LS, IL-ZLS, 12-2LS and l3-2LS are open, so that coil 7CRis not energized.

Because coils lFCM and CR are not energized, contacts 15FCM and 6-2CRare open so that solenoid ZSV is not energized. Because coil ILRCM isnot energized, contact 1-5RCM is open so that solenoid 38V is notenergized. Because switch ISLS is open and because coil IRSM is notenergized so that contact 1-6RCM is open, coil 8CR and solenoid 48V arenot energized even though switch 14LS is closed. Of course, with coil7CR not energized, contact S-ECR in its holding circuit is notenergized.

Because no one of coils IFSM, lRSM, IFCM and IRCM is energized, contacts1-1tiFSM, l-9RSM, 1-6FCM and 1-6RCM are open. Furthermore, contacts6-3CR, 64CR, 7-2CR and 73CR are open because coils 6CR and 7CR are notenergized. This current cannot how through the general field winding GFof generator DCG.

Because coil 2RSM is not energized, contacts 22RSM and 2-3RSM are closedso that current cannot flow through series field Winding 485?. However,normally closed contacts of the relay having coil ZRCM in series withthe series field 4681 for motor 46 are open. Current flow from generatorDCG through armature 48A and series field 485E is prevented becausecoils IRSM and IFSM are not energized so that contacts 1-7RSM and 1-8RSMare open in one circuit and contacts 18FSM and 1-9FSM are open inanother circuit. Similarly current flow from generator DCG through thearmature of motor 46 or its series field is prevented because coils IFCMand IRCM are not energized. Because coil ZRSM is not energized, contacts2-4RSM and 2-5RSM are open so that current cannot flow through armature48A by the DC. circuit containing these contacts to provide the torquefor motor 48 that holds bridge 47 against the stop members at its homeposition. Because coil 2RCM is energized, the normally open contacts ofthe relay having coil ZRCM are closed to connect the armature of motor46 to a 13.0. source by lines similar to lines L9 and L1G for armature48A. Thus motor 46 provides a torque in the right direction to holdbridge 45 at its home position against the stop members.

Let us assume now that a glass sheet G is being moved by conveyor 30toward apparatus 25. The leading edge of sheet G trips and closes switch3L8, 4L8 and SLS. This energizes coil 1CR to close contact 11CR so thatcoil IFSM is energized. The contact LIFSM closes in the holding circuitfor coil IFSM. The contact 1-5FSM closes to energize coil 3TCR. Thecontact 3-2TCR in 2% the holding circuit for coil ETCR closes .tomaintain energization of coil 3TCR.

' Upon the energization of coil IFSM, contact 12FSM opens. Upon theenergization of coil 3TCR, after a delay contact 31TCR opens. Coil lRSMis already deenergized because contacts 1-ZLS and 3-1CR are open.

Upon the energization of coil IFSM, contacts 18FSM and 19FSM close, sothat current flows through armature 48A in the forward drive directionand through series field 483R The contact 1-6FSM closes so that coil 6CRis energized to close contacts 63CR and 6-4CR. The contact 1-.10FSM alsocloses upon energization of coil IFSM so that current now flows throughgeneral field winding GF, resistor 2R2 and variable rheostat 1VR. As aresult, generator DCG provides current at the higher voltage througharmature 48A and through series field 485B to operate motor 48 at fastspeed. The motor 48 drives bridge 47 at fast speed away from its homeposition, i.e., in the direction of movement of and forwardly of sheetG.

The energization of cod lCR also closes contact 1-2CR to energize coilZTCR so that contact 21TCR closes. However, contact 1-4CR opens whencoil 1CR is energized. Thus coil ZCR is not energized.

"When cam 316 on bridge 47 trips switch ltlLS, contact iii-2L5 closesand contact 101LS opens. The coil 6CR is deenergized so that contact6-3CR and contact 64CR open and contact 61CR closes. The coil 7CR isenergized to close contacts 72CR and 73CR. Current now flows throughfield winding GP, resistor 2R2, variable rheostat ZVR and resistor lReso that generator DCG now provides the lower voltage to motor 48. Thebridge 47 now moves at the slower speed. Of course, when coil 7CR isenergized, contact 7-1CR opens to prevent energization of coil eCR atthis time.

While bridge 47 is moving at slow speed, the trailing edge of sheet Gpasses beyond switches 31.5, 41.3 and 5L8 so that they open and coil lCRis deenergized. The electronic timer ETCR stopped when contact 13CRopened upon the energization of coil lCR. However, now contact 13CRcloses, because of the deenergization of coil ICR, to start timer ETCR.At the same time contact 1-2CR opens to deenergize coil ZTCR and contactl-4CR closes. When coil ZTCR is deenergized, contact 21TCR does not openimmediately because it is of the timeopening type. After the delay forwhich electronic timer ETCR is set, contact 1-1ETCR, which is of thetime-closing type, closes. This occurs before contact 21TCR opens sothat coil ZCR is energized. Although contact 2-1TCR opens shortlythereafter, energization of coil ZCR continues because contact 24CR, inthe holding circuit for coil ZCR, closes upon the initial energizationof coil ZCR.

The electronic timer ETCR keeps contact 1-1ETCR closed until coil ICR isenergized to open contact 13CR and, of course, at the same time contact1-4CR opens. This occurs when the next glass sheet G closes switches3L8, 4L8 and 5L8 in the next cycle of operations.

The energization of coil 2CR indicates the presence of glass sheet G atthe position Where it should be stationary for the scoring operations.The energization of coil 2CR stops the drive of the motor for conveyor45 in the following manner. The energization of coil 2CR opens contact23CR to deenergize coils BCM and BCT. The deenergization of coil BCMresults in the opening of contact 11BCM to deenergize coil ITCR. Whencoil BCT is deenergized, contact 1-2BCT closes but contact l-IBCT doesnot open until after a delay because it is of the time-opening type.Thus the coil BCBC is energized through contacts 1-2BCT and 1-1BCT for ashort period of time until contact 1-1BCT opens. The energization ofcoil BCBC opens contact 1-1BCBC to prevent the energization of coil BCMduring the time that energized coil BCBC operates the braking coil forthe motor that drives belt 44. The energization of coil BCBC for

17. AN APPARATUS FOR CUTTING A GLASS SHEET WHICH COMPRISES A CUTTINGSTATION INCLUDING MEANS TO SUPPORT THE GLASS SHEET, A PAIR OF CARRIAGESSUPPORTED AT FIRST AND SECOND OPPOSITE ENDS AND ADAPTED TO TRAVERSE SAIDCUTTING STATION IN RECTILINEAR PATHS SUBSTANTIALLY AT RIGHT ANGLES TOEACH OTHER, FIXED MEANS TO SUPPORT SAID FIRST ENDS OF EACH CARRIAGEALONG SAID PATHS, MEANS ON EACH ONE OF SAID CARRIAGES TO SUPPORT THESECOND END OF THE OTHER CARRIAGE AS EACH CARRIAGE TRAVERSES THE CUTTINGSTATION, AND MEANS, INCLUDING GLASS CUTTER WHEELS, MOUNTED ON EACHCARRIAGE TO SCORE THE GLASS SHEET.
 18. THE APPARATUS OF CLAIM 17INCLUDING MEANS TO RUN CUTS ALONG SCORE LINES ADJACENT TWO EDGES OF SAIDSHEET, SAID MEANS INCLUDING SNAPPING WHEELS MOUNTED ON ONE OF SAIDCARRIAGES FOR MOVEMENT ALONG THE PATH OF TRAVEL OF SAID CARRIAGE ANDBARS BENEATH SAID SHEET AT SAID CUTTING STATION ADJACENT THE PATH OFTRAVEL OF SAID WHEELS AND POSITIONED BETWEEN SAID WHEELS.